public class Example23 {
    public static void main(String[] args) {
        int [] arr =  new int[4];
        arr [0] = 1;
        arr [1] = 2;
        System.out.println("arr[0]=" + arr[0]);
        System.out.println("arr[1]=" + arr[1]);
        System.out.println("arr[2]=" + arr[2]);
        System.out.println("arr[3]=" + arr[3]);
        System.out.println("数组的长度是：" +arr.length);
    }
}
